describe spontaneous combustion.
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when a combustible substance burns on its own without the help of any external heat,it is called spontaneous combustion
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Spontaneous combustion or spontaneous ignition is a type of combustionwhich occurs by self-heating (increase in temperature due to exothermic internal reactions), followed by thermal runaway (self heating which rapidly accelerates to high temperatures) and finally, autoignition.
A substance with a relatively low ignition temperature (hay, straw, peat, etc.) begins to release heat. This may occur in several ways, either by oxidation in the presence of moisture and air, or bacterial fermentation, which generates heat.The heat is unable to escape (hay, straw, peat, etc. are good thermal insulators), and the temperature of the material rises.The temperature of the material rises above its ignition point (even though much of the bacteria are destroyed by ignition temperatures).Combustion begins if sufficient oxidizer, such as oxygen, and fuel are present to maintain the reaction into thermal run-away.
A substance with a relatively low ignition temperature (hay, straw, peat, etc.) begins to release heat. This may occur in several ways, either by oxidation in the presence of moisture and air, or bacterial fermentation, which generates heat.The heat is unable to escape (hay, straw, peat, etc. are good thermal insulators), and the temperature of the material rises.The temperature of the material rises above its ignition point (even though much of the bacteria are destroyed by ignition temperatures).Combustion begins if sufficient oxidizer, such as oxygen, and fuel are present to maintain the reaction into thermal run-away.
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